How to calculate the luminous wavelength of LaB_6 at a specific temperature?
Silimbuga92
Open question
2022-08-20
Answer & Explanation
Bobby Hodges
Beginner2022-08-21Added 6 answers
at 1700 deg C, the peak wavelength is at 1.5 microns, and continuous through the visible spectrum monotonically decreasing sharply from red to blue. I doubt you will see a classic Airy disk consisting of a central spot and concentric rings. The size of the hole also plays a role, as does the size of the cathode and the distance from the cathode to the hole.
But since the radiation is predominantly red, and the eye is most sensitive at around 550 nm, a reasonable choice for a characteristic wavelength is 650 nm. A calculation can be done to find the peak wavelength of the perceived spectrum, but given the continuous spectrum, I don't believe it would help more than this hand-waving argument.
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